No vertext but looks like there is
It might be related to this issue
Limited Dissolve leaves unused Vertices
I find it easier to dissolve edges - as it will delete the vertices along with it
As a solution you can probably use the knife tool to make a new single edge and use dissolve edges on the other two edges to remove them.
the colouration is most likely from the amount of connections (6) to that vertex. as you have another edge pulling at it. wire mode help to visualise or showing all edges on mesh in object property settings